I think that John Deere Corn Head Grease is/was grade 0 - Tractor Supply used to sell it.

Steering Gear oil/grease (self-levelling grade 00 grease) is grade 00
https://www.tractorsupply.com/tsc/product/super-s-cotton-picker-spindle-grease-00

https://www.classicchevy.com/champion-00-manual-steering-box-grease.html
Attachments
NLGI Grades.png (4.59 KB, 600 downloads)